Boiler-inside-tube cutter



Patented Aug. 24, 1926.

RAPHAEL ETTER, on MENAI-IGA, MINNESOTA.

IBOILER-INSIDE-TUBE CUTTER.

Application filed .Tune 7,

The invention provides a tool which is simple in construction and adapted to be manufactured without requiring expensive machinery, and which enables a tube or fiue 5 to be quickly cut with the expenditure of a minimum amount of energy.

Other objects and advantages Will be apparent and suggest themselves as the nature of the invention is understood.

l/Vhile the drawings llustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the spirit of the invention.

Referring to the accompanying drawings forming a part of the application Figure l is a side View of a boiler tube cutter embodying the invention; and

Figures 2 and 3 are detail perspective views of opposite endsof the tool showing the same on a larger Scale.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference Characters.

The tool consists of a bar 1 which may be of any length, cross-sectional outline and diameter depending upon the particular work and the size of the tool, it being understood that it is the intention to provide' the tool in different sizes. It is proposed to make the tool of black damond tool steel although any tool steel may be employed, depending upon the cost and nature of the article. The ends of the bar 1 are deflected laterally at opposite angles as indicated at 2 and 3 and rocked whereby to move the 1924. 'Se'iaI No. 718,563.

are recurrently inclined in opposite directions as indicated at 4: and The ends of 40 the recurrently inclined portions 4 and 5 are recurved as shown at t and respectively, and have. their extremities sharpened as shown at 6. The inclined end portions 2 and 3 form cams upon which the bar is cutter laterally and force it through' the side of the tube. The two angles enable a person to work on tubes next to the fire-box wall or smoke chamber in fire-box type ofboiler, either end being selected as may be found most advantageous.

l/Vhen using the tool an end portion is inserted within the tube a distance to clear the tube sheet and by moving the outer end of the bar l laterally, the cutter within the tube is caused to penetrate the side thereof, and this operation is repeated until the tube or flue is cut. v

WVhat is claimed is A boiler tube cutter including a rigid bar of the crow-bar type formed straight throughout the major portion of its'length, an end portion of said bar being inclined at an angle to said major portion, the portion of said bar at the end of said inclined 'portion recurrently inclined relatively to` the first mentioned inclined portion and to the major portion aforesaid, and the extremity of the bar recurved and sharpened 7 to a cutting edge, said first mentioned inclined portion' forming a fulcrum for operation of the sharpened eXtremity.

In testimony whereof I afiix my signature.

. RAPHAEL ETTER. 

